Grinding machine



Aug. 19, 1941.- H. E. 505055 ErAL GRINDING MACHINE 1 Filed July 31, 1940 4 Sheets-Sheet 1 mm W m w EJ ATTORNEY Aug. 19, 1941. H. E. soMEs ETAL GRINDING MACHINE Filed July 31, 1940 4 Sheets-Sheet 2 19, 1941- H. E. SOMES .ET AL 2,252,813

GRINDING MACHINE Filed. July 31, 1940 l 4 Sheets-She et 3 INVENTOBS fiowar dzi Somes Jfluel ler .T- lojo A TTORNE Y Aug. 19, 1941. I

H. E. SOMES ETAL GRINDING MACHINE Filed ul '51, 1940 4 Sheets-Sheet 4 JZYzzeZZer ATTORNEY ing drawings.

Patented Aug. 19, 1941 UNITED STATES PATENT OFFICE" azsasia canmmc moms Howard E. Borneo and Friedrich J. Mueller,

Detroi t, Mich.

Application July :1, 1940, Serial No. 348,756

g 1: Claims. This invention relates to a cutting or grinding machine ofthe type adapted to shape stock fed continuously therethrough' and is especially adapted to the shaping of such stock such that opposite surfaces will be plane and in any desired angular relation with respect to each other. The machine has been particularly useful in shaping thin iron laminations for transformers in which the core is in the form of an annulus and the individual laminations are in the form of thin radial sectors, this latter shape being essential where a maximum amount of iron is to be built into an annular transformer core with a minimum of waste space.

The present machine is adapted to cut flat strip stock fed continuously through the machine so as to produce thin wedge section stock which may have accurate plane surfaces and the cross section of which stock may remain the same. The apparatus is especially constructed so as to rigidly adhere to such adjustments as are made for finishing the surfaces of such flat stock and is so arranged as to be readily adjustable to cut any desired cross section.

'Accordingly, it is an object of the present invention to provide a rugged readily adjustable machine for cutting or grinding strip stock of uniform cross section along its length.

Another object of the invention is to provide an apparatus in which strip stock of rectangular cross section is fed continuously therethrough and in which either surface thereof or both may be ground at an angle to one another to provide a strip of fixed sector cross section, the machine being particularly adapted for quick adjustment, 3 accurate. truing of the cutting or grinding wheel of illustration only and are not designed as a definition of the limits of the invention, reference being had for this purpose to the appended claims.

In the drawings wherein like reference .nu-

merals indicate like parts:

It is expressly understood, however, that the drawings are employed for purposes Figure 1 is a side elevation of the grinding or cutting apparatus, certain invisible parts thereof being indicated to show their location.

Figure 2' is a top plan view of the grinding machine, certain invisible parts thereof being indicated to show their location.

Figure. 3 is a transverse vertical section taken substantially on the line at 3-3 of Figure 1.

Figure 4 is a transverse vertical section taken substantially on the line 4-4 of Figure 1 and Figure 5 is an enlarged sectional view of a portion of the cutting wheel and strip guiding mechanism taken substantially on the line 5-4 of Figure 4.

Referring to the drawings and particularly Fig- I ure 1, there is illustrated a main support member I! carrying cutting or grinding wheels I! and I4, each of which is illustrated as being of the abrasive cylindrical grinding face type. At each end 2 ..of the machine is provided a bracket I 8 and I8 carrying stock reels and 22 from which thin strip stock is initially fed and thereafter rereeled. Each of the grinding wheels and the mechanism for guiding the strip material thereagainst in a 25 highly accurate manner is similar in many respects with the exception that one is inverted and adapted to operate upon an opposite side of the strip material from that upon which the other is adapted to operate. Referring to Figure 4 which illustrates the grinding wheel adapted to operate upon the top surface of the strip, there is illustrated a main bearing assembly 24 housing the shaft 26 carrying the grinding wheel II, the shaft 26 being driven by a pulley 28, belt drive 3|! and suitable motor 32. The grinding wheel, as is illustrated, is rigidly secured upon the frame It in a rigid manner and the main bearing assembly 24 is such as to provide an accurate bearing for the wheel throughout its life, the bearing being of a type especially protected from entrance of abra-,

sive or foreign matter which would be likely to cause unusual wear and loss of accurate centering.

To accurately guidestrip material, indicated at 34 in elevation in Figure 1, and illustrated in engagement with the lower peripheral portion of the grinding wheel I! in Figure 4, an adjustable but otherwise rigidly supported mechanism is provided. For example, a main bracket member 34 is vertically slidably mounted upon ways 38 and 40 rigidly carried upon the vertical front face of the frame l0 and the bracket is elevatable to any desired height through a heavy feed screw 42 carried by the bracket and threaded into a stationary threaded block 44 arranged upon the 5 back side of the front faceof the frame It. The

2 screw 42 is provided at its upper end with a suitable pilot bearing 40 and an end thrust bearing 48 so that lateral and axial motion with respect to the bracket is prevented and the bearings are protected from the entrance of abrasive or foreign matter through a packing gland arranged upon the underside of the bearings 40 and 40. Rotation of the screw is effected through in. fore and after bearings 00 and 00 and central bearing carried by the bracket 05, the shaft 04 carrying a worm wheel 00 which in turn engages a worm wheel 02 (see Figure 1) secured upon the feed screw 42. l

The bracket 00 is provided on its top with a sub-J stantially horizontal face 04 upon which is mounted a horizontal guide or way 66 preferably extending substantially parallel with the axis of the abrasive wheel shaft 20. Slidable fore and aft upon the way 60 are a pair of guide members 68 and I0'hinged together at one end about a a hand wheel 52 carried upon a shaft 54 journaled center I2. The lower member 60, which is slid- The member I0 is provided with a way 04 in which is adjustably positioned a stock rest 06, the latter being providedwiih a hardened central face member 00 immediately beneath the wheel I2 in order to support the strip material 34 rigidly againstthe face of the grind wheel. The rest "is adjustably positioned in the way 84 and may be locked inany desired place by drawing a complemental portion 00 of the way 84 tight against the rest 80.

In order to change the angular relation bewheel or toward or away from the pivotal axis 12 between the hinged members and 00. The

contact surface of the block which extends through a vertical plane passing through the axis of the grind wheel I2, in practice, is preferably so arranged as to extend through the axis 12 of the hinged members I0 and 68 and in order to grind the strip material 34 toa proper segmental shape the bracket 36 and the members supported thereon are vertically adjusted so that the pivotal axis I2 is-tangential to an imaginary cylindrical extension of the peripheral cylindrical grinding surface of the grinding wheel I2. By so adjusting the position of the pivot 12 with respect to the grinding wheel the selected angle be.- tween the members I0 and 00 will effect grinding of strip stock fed therethrough accurately so that the stock emerging therefrom will have a sector shape suitable for assembly, for example, in a transformer ring core having an internal radius equal to the distance from the pivotal axis 12 and the adjacent edge of the strip stock 04 as it passes beneath the grinding wheel I2.

In practice, where it is preferable togrind both faces of the strip stock, a second grinding wheel I4 is provided which may have its strip guiding apparatus so adjusted as to merely polish the under-surface of the strip stock or it may be so tween the hinged members 00 and 10 to any desired degree and 'to accurately and positively secure them in the chosen angular relation, a hand wheel 02 having an internally threaded bore 94 and cooperating threaded pin 96 is provided, the pin 00 being secured to the member 68 substantially perpendicular thereto, and the hand wheel 02 being swivelly mounted with respect to the member I0 and held against axial movement with respect thereto through a set screw 98 cooperating with a groove I00 in the shank of the hand wheel 02. Looking of the members 68 and I0 in any desired position is ef-'- fected by tightening a'nut I02 upon a bolt I04 extending between upstanding ears I00 upon the member 68, the ears being adapted to engage the sides I08 of the member I0 and thereby rigidly clamp the members 80 and I0 against relative movement. In order to broaden the bearing surface between the sides I00 of the member I0 and the ears I00 of the member 08, the member I0 is provided with bifurcated depending ears IIO arranged about the bolt I04 and to provide a suitable range'of adjustment, the apertures in the ears I00 through which the bolt I04 extends are vertically slotted as indicated at II2.

In order to guide the strip material 04 across the hardened block 00, which may for the purpose be made of Carboloy, suitable pins II4 mounted upon brackets IIO secured to the upper face of the member 10 are provided, the pins being grooved as is indicated particularly in Figure 3 at IIO to fix the strip material against lateral movement parallelwith the axis of the grind adjusted as to additionally cut the strip stock to a new sector cross section corresponding to the final desired cross section. In practice, however, either wheel may be employed without the other if a single grinding operation is suilicient and the initial opposed face of the strip material is sufiiciently smooth to serve for the purposes desired.

The second grinding wheel I4 is carried in a bearing I20 identical-to that provided for the wheel I2. In this instance, as is illustrated in Figure 3, the bearing I20 is positioned in an aperture in the. frame I0 and the work support is arranged thereabove. The grindingwheel I4 is driven through a belt drive 30' by a motor 02'. As in the previous arrangement, the work support comprises a bracket I22 vertically slidable upon ways I24 and its vertical position is adjustable through the operation of the hand wheel I20 acting upon the worm and worm wheel I21 and I28, respectively, arranged on the vertical adjustment screw I30. The vertical adjustment screw acts upon the threaded block I32 secured to the bracket I22 and is piloted in fixed position in the bracket through the thrust bearing I34 and the bearing I36.

Insofar as the stock guide in conjunction with this wheel is concerned, the structure is substantially identical to the guide described in conjunction with the abrasive wheel I2 and similar reference characters are, therefore, applied to these parts although inverted.

In order to assure a true cylindrical grinding face upon the wheels I2 and I4, truing or dressing devices I30 and I40 are provided in conjunction with each wheel. Each device includes a diamond cutting point I42 which is adjustable toward and away from the wheel through the manual screw adjustment I44 and its carriage is adjustable in a direction parallel to the axis of the wheel through the screw adjustment I46.

To aid in the grinding operation as well as to I flush away the abraded material, suitable jets are provided in conjunction with each wheel through which a cutting fluid issupplied. For example, in conjunction with the grinding wheel I2 the jet I40 is provided and in conjunction with an grinding wheel u there is provided the jet I", each jet being supported from the frame II in any suitable manner for example as illustr'ated. There are similarly provided jets ill being unduly thrown by the rapidly rotating abrasive wheels and the'entire machine is positioned in a floor pan "2 into which the spent fiuid finally gravitatesfrom the various guards such asfor example the guard or bailie lli around the guide block supporting members it and II,

.the' guards I63 and I around the abrasive wheels I! and I4, and the catch trough It] underneath the wheel ll. From the fioor pan the .fiuid is filtered in a manner well understood in the art in order to remove abrasive materials and thereafter returned to the tank Jill from whence it is again pumped to the various jets.

If desired, in order to further assure of the removal of abrasive material a filter I may be provided directly in the suction line"! of the Dump.

7 II with respect to the grinding wheel so that the under-surface of the strip materialifor example as it is fed against the abrasive wheel it) lies in a plane passing throughthe axis 12 and such that the ground. face on the top side of the strip material likewise lies' in a plane passing through the same axis. when the machine is so adjusted, it is merely necessary to position the axis 12 with respect to the shouldered guide-pins ill a distance equal to the radius of the sector shape of strip material which is to be cut, and

this radius may be varied quickly to grind other shapes'provided the way it is parallel with the axis of the abrasivewheel shaft 2|, by simply sliding the hinged guide support members It and II through manipulation of the hand screw ll. It will be observed that the diameter of the grinding wheel is relatively great and that con-; sequently the wear thereon is extremely gradual equivalent amount and thus by providing such indicators, such compensations for wear may be very quickly Instead of-indicators it may only'be necessary to know the extent of adjustment, for example with respect to the diamond dressing tool per. turn of the adjusting knob I and effecting corresponding adjustment through the hand wheel 52. The latter may be provided with a settable indicating drum 58 cooperating with a stationary indicator 5! arranged in conjunction with the bearing support it of the wheel shaft 61. Adjustment asto the speed of moving the strip material through the machine a may be made by a selection ofa proper reduction so that trimming of the wheel through the use 1 of the diamond I42 will not be required except after extended use. Thus once the apparatus is adjusted it. need merely be checkedat such intervals as are found to be desirable for accuracy.

' tice, indicators may be employed in conjunction with the various adjustments, it appearing'that with the dressing of one of the wheels by a specific amount, it would be merely necessary to a move the main bracket toward the wheel by an a gear I" or by employing an adjustable speed motor I 58. In order that the strip material may .be fed through at a uniform rate and wound the various ways will bepreferably provided with wear strips effecting close fit and a minimum of lost motion as illustrated and as will be well un-v derstood in the art.

' Though a single embodiment of the invention has been illustrated and described, it is to be understood. that the invention is not limited thereto but may be embodied in various mechanical arrangements. .As such changes in the construction and form of the parts may be made without departing from the spirit of the invention, as will be apparent to those skilled in the art, reference will be had to the appended-claims for a definition of the limits of the invention. This invention is an improvement on that shown and describedin' the co-pending applicatlon of Howard E. Somes, Serial No. 266,912, filed April 8, 19 39, for Grinding machine, in which some of the broader aspects of the machine of this invention are claimed.

What is claimed is:

1. In an apparatus of the class described, a support, a rotatable shaft having a peripheral concentric cutting means thereon, a work bracket adjustably mounted on said support, and movable toward and away from said cutting means, a work guide comprising hinged members, one being slidable on said bracket and the other having a work rest adapted to hold the work against said cutting means, and means for adjusting the hinged relation of said members to vary the angle 'of said work rest with respect to the cutting means.

2. In an apparatus of the class described, a support, a rotatable shaft having a peripheral concentric cutting means thereon, a work bracket adjustably mounted on said support, and movable toward and away from said cutting means,

a work guide comprising hinged members, one

being slidable on said bracket and the other having a work rest adapted to hold the work against said cutting means, means for adjusting the hinged relation of said members to vary the angle of said work rest with respect to the cutting against said cutting means, means for adjusting grinding face concentrically arranged on said shaft, a work bracket slidably arranged upon said support, and adapted to move toward and away from said shaft and wheel, a work guide comprising hinged members, one being slidable on .said bracket substantially parallel with the axis of said wheel, and the other having a hardened work guide thereon, said members being hinged about an axis substantially transverse to the axis of said wheel and the movement of said bracket toward and away from said wheel, and means' for adjusting the angle between said members.

4. In an apparatus of the class described, a support, a rotatable shaft carried thereby, a grinding wheel having a substantially cylindrical grinding face concentrically arranged on said shaft, a work bracket slidably arranged upon said support, and adapted to move toward and away from said shaft and wheel, a work guide comprising hinged members, one being slidable on said bracket substantially parallel with the axis of said wheel, and the other having a hardened Wcrkguide thereon, said members being hinged about an axis substantially transverse to the axis of said wheel and the movement of said bracket toward and away from said wheel, means for adjusting the angle between said members, and means carried by said work guide carrying member for securing a workpiece against movement transverse to the plane of said wheel.

5. In an apparatus of the class described, a support, a rotatable shaft having a peripheral concentric cutting means thereon, a work bracket adjustably mounted on said support, and movable toward and away from said cutting means, a work guide comprising hinged members, one being slidable on said bracket and the other having a work rest adapted to hold the work against said cutting means, means for adjusting the hinged relation of said members to vary the angle of said work rest with respect to the cutting means, a pair of strip stock reels rotatably mounted on said support, and a brake for resisting the rotation of one, and power means for rotating the other. I

6. In an apparatus of the class described, a support, a rotatable shaft having a peripheral concentric cutting means thereon, a work bracket adjustably mounted on said support, and movable toward and away from said cutting meansga work guide comprising hinged members, one being slidable on said bracket and the other having a work rest adapted to hold the work the hinged relation of said members to vary the angle of said work rest with respect to the cutting means, and a work guide adjacent said work rest tofix the position of a work piece transversely with respect to the plane of said peripheral cutting means, a pair of strip stockreels on said support, and meansfor guiding strip material from one across said work guide and rest and to 4 the other.

7. In an apparatus of the class described, a ,55 support, a rotatable shaft carried thereby, a grinding wheel having a substantially cylindrical grinding face concentrically arranged on said shaft, a work bracket slidably arranged upon said about an axis substantially transverse to the axis of said wheel and the movement of said bracket toward and away from said wheel, and means for adjusting the angle between said members,

means for supplying cutting fluid to said grinding wheel adjacent said work guide, means for catching cutting fluid discharged therefrom, flltering and again delivering the fluid to said supplying means.

8. In an apparatus of the class described, a support, a rotatable shaft carried thereby, a grinding wheel having a substantially cylindrical grinding face concentrically arranged on said shaft, a Work br acket slidably arranged upon said support, and adapted to move toward and away from said shaft and wheel, a work guide comprising hinged members, one being slidable on said bracket substantially parallel with the axis of said wheel, and the other having a hardened work guide thereon, said members being hinged about an axis substantially transverse to the axis of said wheel and the movement of said bracket toward and away from said wheel, means for adjusting the angle between said members, and means carried by said work guide carrying member for securing a work piece against movement transverse to the plane of said wheel, a pair of strip stock" reels on said support, and means for guiding strip material from one reel to said work guides and rest and thence to said other reel;

9. In an apparatus of the class described, a support, a rotatable shaft having a peripheral concentric cutting means thereon, a work table carried on said support, a work guide comprising hinged members, one being slidable on said table and the other having a work rest adapted to hold the work against said cutting means, and means for adjusting the hinged relation of said members to vary the angle of said work rest with respect to the cutting means.

10. In an apparatus of the class described, a support, a rotatable shaft having a peripheral concentric cutting means thereon, a work bracket mounted on said support, and a work guide comprising hinged members, one being slidable on said bracket and the other having a work rest adapted to hold the work against said cutting 11. In an apparatus of the class described, a'

support, a rotatable shaft carried thereby,. a grinding wheel having a substantially cylindrical grinding face concentrically arranged on said shaft, a work table arranged on said support, a

work guide comprising hinged members, one being slidable on said bracket substantially parallel with the axis of said wheel, and the other having a hardened work guide thereon, said members being hinged about an axis substantially transverse to the axis of said wheel, and means for adjusting the angle between said members.

' 12. In an apparatus of the class described, a support, a rotatable shaft carried thereby, a grinding wheel having a substantially cylindrical grinding face concentrically arranged on said shaft, a work bracket upon said support, a work guide comprising hinged members, one being slid- .able on said bracket substantially parallel with the axis of said wheel, and the other having a hardened work guide thereon," said members being hinged about an axis substantially transverse to the axis of said wheel and parallel with a tangent to the wheel at the point adjacent the work guide, means for adjusting the angle between said members, and means carried by said work guide carrying member for securing a work piece against movement transverse to the plane of said wheel.

13. In an apparatus of the class described, a support, a pair of rotatable shafts carried thereby, grinding wheels having peripheries adapted togrind plane surfaces, a work bracket associated with each wheel comprising hinged members, a work guide associated with each bracket and having one member movable upon said bracket in a plane substantially parallel to the grinding plane of the respective grinding wheels, the other member hinged about an axislying in a plane parallel to the grinding plane. oi" the respective grinding wheel and having a hardened work guide thereon, and means for adjusting the 10 angular relation of each of said hinged members.

HOWARD E. SOMES. FRIEDRICHv J. 

